package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    private final String CODE = "code";
    private final String USER = "user";

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1、校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2、不符合，返回错误消息
            return Result.fail("手机号格式错误");
        }

        //3、符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4、保存验证码至session(x) redis
//        session.setAttribute(CODE, code);
        stringRedisTemplate.opsForValue().set(
                RedisConstants.LOGIN_CODE_KEY + phone,
                code,
                RedisConstants.LOGIN_CODE_TTL,
                TimeUnit.MINUTES);


        //5、发送验证码
        log.info("发送验证码：{}", code);

        //6、返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1、校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }

        //2、校验验证码(x) redis
//        Object cacheCode = session.getAttribute(CODE);
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.toString().equals(code)){
            //3、不一致，报错
            return Result.fail("验证码错误");
        }

        //4、一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5、判断用户是否存在
        if(user == null){
            //6、不存在，创建用户并保存
            user = creatUserWithPhone(phone);
        }

        //7、保存用户信息到session中(x) redis
//        session.setAttribute(USER, BeanUtil.copyProperties(user, UserDTO.class));
        //7.1 随机生成token，作为登陆令牌
        String token = UUID.randomUUID().toString(true);

        //7.2 将User转换为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = UserDTO.convertToMap(userDTO);
        //7.3 存储
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(
                tokenKey,
                userMap);
        stringRedisTemplate.expire(
                tokenKey,
                RedisConstants.LOGIN_USER_TTL,
                TimeUnit.MINUTES);

        //7.4 返回token
        return Result.ok(token);
    }

    public User creatUserWithPhone(String phone) {

        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));

        save(user);

        return user;
    }
}
